Why has my MicroSD card quit working?

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http://forums.androidcentral.com – I have a 32gb class 4 ScanDisk MicroSD card for my Droid RAZR M (Jellybean 4.1.1). Everything was fine until sometime yesterday (I think). I noticed this morning that my morning wake-up alarm was not what I had set it to, but was a generic sound. I checked the settings and all my "custom" ringtones were missing. I then went to the files app & saw that the SD card read "0.00 GB available." Clicked on it and it says "SD card not found. Please check that SD card is properly inserted and mounted." Funny, seeing as I haven't removed the card since I got the phone & (HowTos)